Current measuring circuit 1A~2A

Thread Starter

ajitnayak

Joined Feb 22, 2013
49
Dear all.

I am trying to build current sensor module which can measure or sensor range 1~2A. Intially i tried with off shelf product ACS712 Module. But i found they are more distortion at output. Output are not stable. Inspite of building filter or by software i could not able to maintain accuracy to 1%.
These model i already tried
www.sparkfun.com/products/8882

www.sparkfun.com/products/8883

My specification
current sensing range :1~2A
analog output: 0~5v Dc
accuracy :1 %
arduino Board for Programming.

http://openenergymonitor.org/emon/buildingblocks/dc-shunt

Now i am planning to use above circuit for sensing. is anybody suggest me view of designing it. Is any other method i can more accurate analog output.
For me more important accuracy and produce analog output.

I am planning to use below sensor with Lm393 amplification . I don't how to amplify the circuit here.
http://www.winson.com.tw/Data Sheet/WCS2702.pdf
all using
https://www.fairchildsemi.com/datasheets/LM/LM393.pdf
i dont know why they using it??
 
Last edited:

Thread Starter

ajitnayak

Joined Feb 22, 2013
49
My question is can use same circuit for amplify the output of WCS2702 IC. Is there any other IC avilable. I am not getting this IC locally .
 

MikeML

Joined Oct 2, 2009
5,444
Your problem with the Sparkfun module is that you tried to use the entire 0-5V range of the AD input. Forget that, and use 0.5V as the zero current point, and 4.5V as the max current point. A little bit of additional code inside the Arduino can subract out the offset, and adjust the range...

Even rail-to-rail opamps have trouble getting their output all the way to 5V and 0V when powered with a single 5V supply.
 
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